Timber does pant in the evening. It seems like she has been doing it ever since she was sick with the tick disease. Is she hot, in pain, just having trouble breathing? I am not sure. It has actually subsided a little but still seems to come and go. I am also keeping a food diary to see if that could be the trigger. It seems to me she pants more after eating chicken but not absolutely sure if this is the only reason

But yes, I hope it is not pain. I will certainly look into the two drugs you mentioned and ask our vet about them if the panting gets worse. She doesn't pace at all. Overall she sleeps very well and is waking up less than she did when first diagnosed